Duplicating machine



June 17, 1930.

Filed July 20, 1928 Wiin ass Patented June 17, 1930 UNITED STATES.

PATENT F C HERMAN F. HELLMAN, OF CHICAGO, ILLINOIS, ASSIGNOR TO HEYER D'UPLICA'IOR COMPANY, INC., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS DUPLICATING MACHINE Applicationfiled July 20, 1928.

The machine of the present invention is of that type which employs a stencil sheet mounted upon a cylinder as the means for imprinting an impression upon a sheet of paper fed beneath the cylinder and in compressive contact therewith. g

In machines of this character, it has heretofore been customary to employ a single cylinder of given circumferential dimensions, and on this cylinder to mount stencil sheets of a fixed or certain length irrespective of the size of theletter sheets which are fed into the machine to receive the impression. This arrangement is satisfactory where legal sheets of the largest size are to be imprinted, since this requires the use of a full sized stencil, but where smaller letter sheets are to be imprinted the use of a full sized stencil is wasteful and expensive, since a large proportion of the stencil area. is vacant.

The machine of the present invention is designed to overcome the difficulty above noted, by providing for the interchangeable use of a large cylinder and a small cylinder, either of which is designed and mounted to cooperate with the impression roller and other permanent portions of the machine, so that in use the cylinder of proper size to and a stencil sheet of corresponding size mounted upon it, thereby obviating the wastage of stencil sheets occasioned by the The machine is designed to afford a suit able and convenient mounting for either of thecylinders, and to provide for a quick and easy interchange from time to time as occasion may require.

Further objects and details of the invention will appear from the description therehandle the work in prospect may be selected Serial No. 294,106.

of, in conjunction with the accompanying drawings, wherein,

Figure 1 is a perspective View of the machine embodying the features of the present invention, showing the smaller cylinder in full lines, and the larger cylinder in dotted lines;

' Fig. 2 is a longitudinal sectional elevation of the smaller cylinder with the adjacent mountings, the medial portion of the cylin der being broken out;

Fig. 3 is a fragmentary end view showing the end of the larger cylinder, and the compression roller in full'lines, and the smaller cylinder in dotted lines; and I i Fig. 4 is a fragment, showing the inner face of one of the journal brackets for mounting the cylinders.

The machine as a Whole comprises end frames 10 ofwhich one only is shown in Fig. 1, which end frames are of substantially. uniform formation, so that a description of one applies to both.

The end frames are connected by tie rods 11, 12 and 13, or in any other'suitable and convenient manner. Each of the end frames comprises a horizontal body portion 14: supported upon legs 15-and having a journal bracket 16 upstanding from the body por tion- I The journal bracket near its upper end is provided with a lower journal opening 17 and an upper journal opening 18. The journal openings in one of the brackets are provided with keyways 20 and 20 which keyways, however, are not present in the journal openings at the opposite side of the machlne. The upper and lower journal openings at both sides'of the machine are of uni-' form diameter and adapted to receive and journal the opposite ends of a shaft 19 pro-j vided at one end with a key 21 which is adapted to slip through either of the keyways in the adjacent bracket and lodge. in a key slot 20 in the proximate head 22 of a stencil carrying cylinder, which also fcomprises a head 23 and a cylindrical bodywall 24:.

As shown in'Figs. 1 and 2, the cylinder shaft 19 when inserted through the lower openings 17, or it may be of a larger size to be mounted upon the sameshaft when the latter is entered through the upper openings 18.

Two cylinders are provided, and the upper and lower journal holes are properly spaced and located in such relation that both cylinders will present their surfaces at the same lower level to make contact with a compression roller 25 of rubber or composition of the character commonly employed for a like purpose.

In order to facilitate the introduction of either of the cylinders into its proper place in the machine, and to facilitate the introduction of the shaft 19 into place, the following features are provided:

Each ofthe brackets 16, onits inner face, is provided with a lower semi-cylindrical journal flange 26 and an upper semi-cylindrical journal flange 27, the lower flanges being concentric with the journal openings 17, and the upper flanges being concentric with the journalopenings 18.

Each of the cylinder heads is provided with a thickened hub which affords an outwardly projecting circular boss 28 of a size to socket into one or the other of the journal flanges just described.

In order to properly center the respective cylinders in'register with the intended ournal openings, the inner face of each bracket is shouldered at the point29 so as to bring the lower journal flanges on opposite sides of the machine into slightly closer relation than the upper journal flanges which socket the larger cylinder 'The smaller cylinder is made slightly shorter than the larger cylinder, so that when the smaller cylinder is being positioned it will slip down past the shoulders 29 and socket within the lowermost journalflanges, while in the case of the larger cylinder it will find its position within the upper pair of'journal flanges, so that in each case, when the intended cylinderhas been positioned,'the shaft'holes in the opposite heads of the cylinder will register with the intended journal-openings,'so that the sha'ftmay be insert-ed in place to properly mount the cylinder and afford a means for rotating the same.

The shaft can only be fully inserted when the keyways in the cylinder head and adj acent bracket are aligned so that the-key 21 on the shaft may'pass through the bracket keyway and into the keyway in the cylinder,

head. "It is preferred to make the fitting of these parts sufliciently snug, so that additional-means for securing the shaft against accidental withdrawal'will be unnecessary, although displacement in any event is not likely, in view of thefact that the shaft cannot be withdrawn until the keyways are againaligned exactly with one another. The

extent of the insertion of a shaft is limited by a handle hub 30 forming part of a handle 31 terminating in a knob 32 for rotating the cylinder.

Each cylinder has mounted thereon an inking pad 33 over which the stencil 34; is laid and fastened by means of the usualbuttons 35 carried by a cross bar 36 of the type generally employed in mechanisms of this general character. The oppositeend of/the stencil sheet is clamped in placeby means of a spring wire clamp 37 or any other suitable securing means.

Thepaper sheets are fed from a table 38 upon which rests a gauge plate 39 having end and side flanges 40 and 41 respectively, which arrangement permits the letter-sheets to be properly gauged to bring theirleading edges into the bite of the cylinder and compression roller, so that when the handle is rotated in a counter-clockwise direction the sheets will be fed through the machine to receive the stencil impression and be delivered onto a tray 42 at the opposite end of the machine.

In use, cylinders of varying size will be provided for each machine,either of which may be used as occasion may require. To make an interchange of cylinders, it is-only necessaryto withdraw the shaft and introduce the other cylinder into-its place, after which the shaft may be re-inserted in the manner previously described.

Although the machine is designed with especial reference to the mounting of two cylinders of different diameters, it is obvious that a group of cylinders of the same diameter, but each inked with a different color, maybe used interchangeably in the manner specified, and it is also obvious that two groups of cylinders of different sizes and diflerently inked may be likewise employed, the method of quick interchange of cylinders enabling. a group of cylinders to be advantageously used with different inksas may from time to time be necessary. This obvi-i ates the necessity of removing the ink pad from a cylinder and replacing it with a new ink pad every time a different colored ink is desired, which frequent replacement of ink pads is wasteful ofink, and is-otherwise disagreeable and objectional from the standpoint of cleanliness andloss oftime in making replacements. I l

The invention as a whole is extremely simple and promotes the convenience and facility with which machines of this character may be employed. 7

Although the invention has been described with particularity as to detail, it is not the intention to limit the invention to the form shown and described, since variations may be made without departing fromthe spirit of the invention. 1

I claim:

1. In a duplicating machine, the combination of a frame comprising side members, a compression roller journalled between the side members, each side member having upper and lower journal openings formed therein, half circular journal flanges formed on the inner faces of the respective side frame members concentrically with the respective journal openings, a stencil carrying cylinder provided at each end with a. hub adapted to socket within corresponding half circular journal flanges, each of the hubs being provided with a centrally dis posed opening, a shaft entered through corresponding journal mountings in the. side frame members and through the openings in the cylinder hubs for mounting the cylinder, and a handle on the end of the shaft, the arrangement providing for the interchangeable use of stencil cylinders of difierent sizes.

2. In a duplicating machine, the combination of a frame comprising side members, a compression roller journalled between the side members, each side member having upper and lower journal openings formed therein, the journal mountings on one side being provided with keyways, half circular journal flanges formed on the inner faces of the respective side frame members concentrically with the respective journal openings, a stencil carrying cylinder provided at each end with a hub adapted to socket within corresponding half circular journal flanges, each of the hubs being provided with a centrally disposed opening, one of the openings being provided with a keyway, a shaft entered through corresponding journal openings in the side frame members and through the openings in the cylinder hubs for mounting the cylinder, said shaft having formed thereon a key adapted to register with the respective keyways when the latter are in register, and a handle on the end of the shaft, the arrangement providing for the interchangeable use of stencil cylinders of different sizes.

3. In a duplicating machine, the combination of a frame, a compression roller mounted in the frame, said frame comprising side members each having formed therein a plurality of journal mountings in variously spaced relation to the compression roller, a stencil carrying cylinder mounted within a selected pair of journal mountings, in position when mounted to present its surface in compressive relation to the compression cylinder, and means for rotating the stencil carrying cylinder.

4. In a duplicating machine, the combination of a mounted in the frame, said frame comprising side members each having formed therein a plurality of journal mountings in variously spaced relation to the compression frame, a compression roller 

